NotEnoughItems/src/main/java/codechicken/nei/SpawnerRenderer.java

package codechicken.nei;

import net.minecraft.client.renderer.OpenGlHelper;
import net.minecraft.client.renderer.RenderBlocks;
import net.minecraft.client.renderer.Tessellator;
import net.minecraft.client.renderer.entity.RenderManager;
import net.minecraft.client.renderer.texture.TextureMap;
import net.minecraft.entity.Entity;
import net.minecraft.entity.boss.BossStatus;
import net.minecraft.init.Blocks;
import net.minecraft.item.ItemStack;
import net.minecraft.world.World;
import net.minecraftforge.client.IItemRenderer;

import org.lwjgl.opengl.GL11;
import org.lwjgl.opengl.GL12;

import codechicken.core.ClientUtils;
import codechicken.lib.render.CCRenderState;

public class SpawnerRenderer implements IItemRenderer {

    @Override
    public boolean handleRenderType(ItemStack item, ItemRenderType type) {
        return true;
    }

    public void renderInventoryItem(RenderBlocks render, ItemStack item) {
        int meta = item.getItemDamage();

        if (meta == 0) meta = ItemMobSpawner.idPig;

        String bossName = BossStatus.bossName;
        int bossTimeout = BossStatus.statusBarTime;
        boolean bossHasColorModifier = BossStatus.hasColorModifier;
        try {
            World world = NEIClientUtils.mc().theWorld;
            ItemMobSpawner.loadSpawners(world);
            CCRenderState.changeTexture(TextureMap.locationBlocksTexture);
            render.renderBlockAsItem(Blocks.mob_spawner, 0, 1F);
            GL11.glPushMatrix();

            Entity entity = ItemMobSpawner.getEntity(meta);
            entity.setWorld(world);
            float f1 = 0.4375F;
            if (entity.getShadowSize() > 1.5) f1 = 0.1F;
            GL11.glRotatef((float) (ClientUtils.getRenderTime() * 10), 0.0F, 1.0F, 0.0F);
            GL11.glRotatef(-20F, 1.0F, 0.0F, 0.0F);
            GL11.glTranslatef(0.0F, -0.4F, 0.0F);
            GL11.glScalef(f1, f1, f1);
            entity.setLocationAndAngles(0, 0, 0, 0.0F, 0.0F);
            RenderManager.instance.renderEntityWithPosYaw(entity, 0.0D, 0.0D, 0.0D, 0.0F, 0);
            GL11.glPopMatrix();

            GL11.glEnable(GL12.GL_RESCALE_NORMAL);
            OpenGlHelper.setActiveTexture(OpenGlHelper.lightmapTexUnit);
            GL11.glDisable(GL11.GL_TEXTURE_2D);
            OpenGlHelper.setActiveTexture(OpenGlHelper.defaultTexUnit);
        } catch (Exception e) {
            if (Tessellator.instance.isDrawing) Tessellator.instance.draw();
        }
        BossStatus.bossName = bossName;
        BossStatus.statusBarTime = bossTimeout;
        BossStatus.hasColorModifier = bossHasColorModifier;
    }

    @Override
    public void renderItem(ItemRenderType type, ItemStack item, Object... data) {
        switch (type) {
            case EQUIPPED:
            case EQUIPPED_FIRST_PERSON:
                GL11.glTranslatef(0.5F, 0.5F, 0.5F);
            case INVENTORY:
            case ENTITY:
                renderInventoryItem((RenderBlocks) data[0], item);
                break;
            default:
                break;
        }
    }

    @Override
    public boolean shouldUseRenderHelper(ItemRenderType type, ItemStack item, ItemRendererHelper helper) {
        return true;
    }
}